Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 50627b04a45f773cc314e363e2111600a5a0b5cfd92ceaf82bbd9c57d6bcc8de:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16